JPH04177883A - Optical functional element - Google Patents

Abstract

PURPOSE:To manufacture optical functional elements at low cost by making receptacles by transfer molding. CONSTITUTION:Optical functional element simple substances 11 are sealed by transfer molding with transparent resin 50 and then sealed by transfer molding with opaque resin 51. since plugs are inserted into the opaque resin, the opaque resin has through holes reaching the surface of the transparent resin 50 and fixation parts 321 for positioning fitted to the claws of the plugs. Thereby labour to fasten the optical functional element simple substances to the inside of receptacles by bond is saved and manufacture cost is lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical functional element, and particularly to an optical functional element for plastic fiber.

[Conventional technology]

Since plastic fibers with a core diameter of about 1.0 mmφ are widely used, dimensional accuracy is not required for axis alignment with the light-emitting element surface and the light-receiving element surface, and resin-molded plugs and receptacles are used. Sufficient dimensional accuracy can be ensured by the interlocking of these resins. Therefore, optical functional devices can be manufactured at relatively low cost, and their application fields and uses are wide-ranging. Currently, they are mainly used in consumer equipment (transmission of digital audio signals), and there is a demand for cheaper ones.

Conventional optical functional elements for plastic fibers are shown in Figure 3.
As shown in FIG. 4, a single optical functional element 41 molded with a transparent resin is fixed inside a receptacle 42 with an adhesive or the like.

A plug 43 equipped with a plastic fiber 44 is inserted into a receptacle 42 containing this optical functional element 41, and the tip of the plug 43 is brought into contact with the light emitting surface 312 or the light receiving surface 312 of the optical functional element to transmit an optical signal. will be carried out. FIG. 3 is a top view of the structure of the connecting portion connected by combining the parts shown in FIG. 4.

That is, positioning is performed by engaging the pawl 322 provided on the locking piece of the plug 43 with the pawl stop 321 provided on the receptacle 42, and the tip of the plug 43 is aligned with the light emitting surface of the optical functional element unit 41. , in contact with the light-receiving surface. In addition, there are some devices in which positioning is performed not by the engagement of the claw 322 and the claw stopper 321, but by a different structure, but in all conventional techniques, the optical functional element molded with transparent resin or the single 4-receiver 42 is used. It is fixed on the inside with adhesive etc.

[Problem to be solved by the invention]

The above-described conventional optical functional device has the disadvantage that it is difficult to manufacture it at a low cost because the optical functional device 41 and the receptacle 42 need to be manufactured separately and then assembled.

That is, the cost of manufacturing the resin-molded optical functional element 41, the cost of manufacturing the receptacle 42 by injection molding, etc. are added, and the cost of incorporating these and fixing them with adhesive etc. is added. This is the cost required to manufacture the receptacle 42 that houses the optical functional element unit 41. Moreover, the work of assembling the optical functional element 41 into the receptacle 42 is difficult to mechanize and is a manual work, which requires a large amount of labor cost and is an obstacle to cost reduction.

An object of the present invention is to eliminate the above-mentioned drawbacks and provide an optical functional element that can be manufactured at low cost.

[Means to solve the problem]

In the structure of the optical functional device of the present invention, the optical functional device pellet is sealed with a first transfer mold made of transparent resin, and the surface of this is further sealed with a second transfer mold made of opaque resin. Features.

〔Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view showing an optical functional device according to an embodiment of the present invention in the process of being manufactured.

In FIG. 1, the state after the first transfer molding with the transparent resin 50 is shown.

In this embodiment, the receptacle 21 is made of resin by transfer molding. That is, as shown in FIG. 1, the optical functional element 11 is first sealed with a transparent resin 50 by transfer molding. Next, as shown in FIG. 2(a), the outer periphery is sealed with an opaque resin 51 by transfer molding.

The outer shape of the resin formed by the second molding is provided with a through hole extending to the first molded transparent resin 50 surface into which the plug is inserted. Further, a locking portion 321 is provided which engages with a claw portion of the plug, thereby performing positioning. Figure 1 shows the transfer molding process.

As shown in FIG. 2(a), this can be carried out in the state of the lead frame 12, and since it is automated, it can be carried out without requiring any manpower, and does not particularly require any manpower. This eliminates the labor-intensive work of fixing a single optical functional element inside a receptacle with an adhesive or the like as in the past, making it possible to create an optical functional element for plastic fibers that can be manufactured at low cost.

Unlike the conventional optical functional device described above, in this embodiment, the optical functional device 41 and the receptacle 42 shown in FIG. The difference is that it can also be manufactured, which helps significantly reduce costs.

In this example, an optical functional element pellet such as a light emitting diode pellet or a light receiving diode pellet is mounted on a lead frame 12, wire bonding is performed, and then the first molding is performed. in this case,
Since it is an element that transmits light, it needs to be made of transparent resin 50. A lens portion 111 is also formed.

FIG. 2(a) shows a state in which the outer periphery of the transparent resin 50 shown in FIG. 1 is molded with opaque resin 51 for a second time to form a receptacle 21.

Finally, as shown in FIG. 3, it is necessary to engage the plug 43 holding the fiber 44 and bring the fiber 44 into contact with the light emitting surface or the light receiving surface 312. There is a through hole extending to the first molded transparent resin 50 surface into which the plug 43 is inserted even after the molding shown in FIG. 321. That is, the conventional plug 43 having the fiber 44 can be used as is. That is, the receptacle 21 shown in FIG. 2(a) is
It is designed to mate with the lever lock type plug of the Japanese Industrial Standard FO5 type single fiber optic connector.

FIG. 2(b) is a perspective view showing an optical functional element according to another embodiment of the present invention. In FIG. 2(b), in this example,
A state in which a receptacle 21 is formed by performing the second molding is shown. In this embodiment, the locking portion 211
However, EIAJ.

It is designed to mate with a plug for digital audio equipment specified in RCZ-6901. In the above two embodiments, a single-core optical connector has been described, but a two-core optical connector or receptacle is also possible.

〔Effect of the invention〕

As explained above, the present invention has the advantage that the receptacle can be manufactured at low cost by manufacturing the receptacle using transfer molding.

[Brief explanation of drawings]

1 and 2(a) are both perspective views showing the manufacturing state of one embodiment of the present invention, and FIG. 2(b) is a perspective view showing the manufacturing state of another embodiment of the present invention. 3 is a cross-sectional view illustrating the relationship between the optical functional element and the plug in the conventional and present embodiments;
The figure is a perspective view showing an exploded state of a conventional optical functional element and a plug. 11.41...Single optical functional element, 12...Lead frame, 111,312...Lens portion, 21.42...
... Receptacle, 50 ... Transparent resin, 51 ... Opaque resin, 321 ... Locking part, 322 ... Claw, 44
...Fiber, 43...Plug.

Claims (1)

[Claims] 1. The optical functional element pellet is sealed with a first transfer mold made of transparent resin, and the surface of this is further sealed with a second transfer mold made of opaque resin. Optical functional element. 2. The optical functional device according to claim 1, wherein the second transfer mold has a pawl stop portion on a part of its outer shape that engages with a pawl of the plug.